| Message ID | 1536158083-30166-1-git-send-email-will.deacon@arm.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Don't use SIGMINSTKSZ when enforcing alternative signal stack size for compat tasks | expand |
Hi all, [+ more people from get_maintainers.pl] On Wed, Sep 05, 2018 at 03:34:41PM +0100, Will Deacon wrote: > This is a resend of: > > http://lists.infradead.org/pipermail/linux-arm-kernel/2018-July/593559.html > > now based on 4.19-rc2. > > The Debian folks have observed a failure in the 32-bit arm glibc testsuite > when running under a 64-bit kernel. They tracked this down to sigaltstack(2) > enforcing the alternative signal stack to be at least SIGMINSTKSZ bytes, > which is higher for native arm64 tasks than compat 32-bit tasks. > > These patches resolve the issue by allowing an architecture to define > COMPAT_SIGMINSTKSZ for compat tasks, which is then used by the sigaltstack > checking code. > > Feedback welcome, Any comments on this, please? I'd really like to get this fixed, since Debian have an outstanding issue without these patches merged. I'm happy to take them via arm64, but would really like an Ack on the changes to signal.c first... Thanks, Will > Will Deacon (2): > signal: Introduce COMPAT_SIGMINSTKSZ for use in compat_sys_sigaltstack > arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ > > arch/arm64/include/asm/compat.h | 1 + > include/linux/compat.h | 3 +++ > kernel/signal.c | 14 +++++++++----- > 3 files changed, 13 insertions(+), 5 deletions(-) > > -- > 2.1.4 >
On Wed, Sep 05, 2018 at 03:34:41PM +0100, Will Deacon wrote: >Hi all, > >This is a resend of: > > http://lists.infradead.org/pipermail/linux-arm-kernel/2018-July/593559.html > >now based on 4.19-rc2. > >The Debian folks have observed a failure in the 32-bit arm glibc testsuite >when running under a 64-bit kernel. They tracked this down to sigaltstack(2) >enforcing the alternative signal stack to be at least SIGMINSTKSZ bytes, >which is higher for native arm64 tasks than compat 32-bit tasks. > >These patches resolve the issue by allowing an architecture to define >COMPAT_SIGMINSTKSZ for compat tasks, which is then used by the sigaltstack >checking code. > >Feedback welcome, Apologies for the delayed response here - conference travel etc . got in the way... I've just tested and I can confirm that this patchset fixes our reported bug (as in https://bugs.debian.org/904385). Thanks Will! Tested-by: Steve McIntyre <93sam@debian.org> -- Steve McIntyre steve.mcintyre@arm.com IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
[ Re-sending without the corporate footer garbage... ] On Wed, Sep 05, 2018 at 03:34:41PM +0100, Will Deacon wrote: >Hi all, > >This is a resend of: > > http://lists.infradead.org/pipermail/linux-arm-kernel/2018-July/593559.html > >now based on 4.19-rc2. > >The Debian folks have observed a failure in the 32-bit arm glibc testsuite >when running under a 64-bit kernel. They tracked this down to sigaltstack(2) >enforcing the alternative signal stack to be at least SIGMINSTKSZ bytes, >which is higher for native arm64 tasks than compat 32-bit tasks. > >These patches resolve the issue by allowing an architecture to define >COMPAT_SIGMINSTKSZ for compat tasks, which is then used by the sigaltstack >checking code. > >Feedback welcome, Apologies for the delayed response here - conference travel etc . got in the way... I've just tested and I can confirm that this patchset fixes our reported bug (as in https://bugs.debian.org/904385). Thanks Will! Tested-by: Steve McIntyre <93sam@debian.org>
On Fri, Sep 28, 2018 at 02:18:11PM +0100, Steve McIntyre wrote: > On Wed, Sep 05, 2018 at 03:34:41PM +0100, Will Deacon wrote: > >Hi all, > > > >This is a resend of: > > > > http://lists.infradead.org/pipermail/linux-arm-kernel/2018-July/593559.html > > > >now based on 4.19-rc2. > > > >The Debian folks have observed a failure in the 32-bit arm glibc testsuite > >when running under a 64-bit kernel. They tracked this down to sigaltstack(2) > >enforcing the alternative signal stack to be at least SIGMINSTKSZ bytes, > >which is higher for native arm64 tasks than compat 32-bit tasks. > > > >These patches resolve the issue by allowing an architecture to define > >COMPAT_SIGMINSTKSZ for compat tasks, which is then used by the sigaltstack > >checking code. > > > >Feedback welcome, > > Apologies for the delayed response here - conference travel etc . got > in the way... I've just tested and I can confirm that this patchset > fixes our reported bug (as in https://bugs.debian.org/904385). Thanks > Will! > > Tested-by: Steve McIntyre <93sam@debian.org> Thanks for confirming Steve. As there is no functional change for other architectures, I'll queue both patches through the arm64 tree. If anyone objects, please let me know before the merging window.